Change default state of MailChimp subscribe

QUOTE: "Specific consent requires some positive action by the subscriber. If an individual omits to deselect an opt-in box you have pre-ticked on (eg an order or enquiry form), that is not a specific consent. If they specifically tick the opt-in box or you make it clear that by entering his email address in a field they are opting in, these are positive acts for this purpose."

It's not consent if a user fails to de-tick a preticked form.

Therefore we need the ability to set the MailChimp subscribe form to de-ticked as default.